test(integration): add DB integration tests for students, promotions, roles, modules

Covers full CRUD for each resource via testDb:
- promotions: list, create, get by id, not found, update, delete
- students: list, filter by promo, create, get, not found, update, delete
- roles: list, create, get with permissions, update+reset perms, delete
- modules: list, create, duplicate id rejection, get, not found, update, delete

27 integration tests passing in CI (act + Gitea Actions).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/integration/modules_test.ts

@@ -0,0 +1,138 @@
+import { assertEquals, assertExists, assertRejects } from "@std/assert";
+import {
+  seedModules,
+  testDb,
+  truncateAll,
+} from "../helpers/db_integration.ts";
+import { modules } from "$root/databases/schema.ts";
+import { eq } from "npm:drizzle-orm@0.45.2";
+
+Deno.test({
+  name: "integration: GET /modules - returns all modules",
+  async fn() {
+    await truncateAll();
+    await seedModules([
+      { id: "MATH101", nom: "Mathématiques" },
+      { id: "INFO101", nom: "Informatique" },
+    ]);
+
+    const rows = await testDb.select().from(modules);
+    assertEquals(rows.length, 2);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "integration: POST /modules - creates a module",
+  async fn() {
+    await truncateAll();
+
+    const [created] = await testDb
+      .insert(modules)
+      .values({ id: "PHYS101", nom: "Physique" })
+      .returning();
+
+    assertExists(created);
+    assertEquals(created.id, "PHYS101");
+    assertEquals(created.nom, "Physique");
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "integration: POST /modules - rejects duplicate id",
+  async fn() {
+    await truncateAll();
+    await seedModules([{ id: "MATH101", nom: "Mathématiques" }]);
+
+    await assertRejects(() =>
+      testDb
+        .insert(modules)
+        .values({ id: "MATH101", nom: "Maths (doublon)" })
+    );
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "integration: GET /modules/:id - returns a specific module",
+  async fn() {
+    await truncateAll();
+    await seedModules([{ id: "ELEC201", nom: "Électronique" }]);
+
+    const row = await testDb
+      .select()
+      .from(modules)
+      .where(eq(modules.id, "ELEC201"))
+      .then((r) => r[0] ?? null);
+
+    assertExists(row);
+    assertEquals(row.nom, "Électronique");
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "integration: GET /modules/:id - returns null when not found",
+  async fn() {
+    await truncateAll();
+
+    const row = await testDb
+      .select()
+      .from(modules)
+      .where(eq(modules.id, "NONEXISTENT"))
+      .then((r) => r[0] ?? null);
+
+    assertEquals(row, null);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "integration: PUT /modules/:id - updates a module",
+  async fn() {
+    await truncateAll();
+    await seedModules([{ id: "CHIM101", nom: "Chimie" }]);
+
+    const [updated] = await testDb
+      .update(modules)
+      .set({ nom: "Chimie organique" })
+      .where(eq(modules.id, "CHIM101"))
+      .returning();
+
+    assertExists(updated);
+    assertEquals(updated.nom, "Chimie organique");
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "integration: DELETE /modules/:id - deletes a module",
+  async fn() {
+    await truncateAll();
+    await seedModules([{ id: "BIO101", nom: "Biologie" }]);
+
+    const [deleted] = await testDb
+      .delete(modules)
+      .where(eq(modules.id, "BIO101"))
+      .returning();
+
+    assertExists(deleted);
+
+    const row = await testDb
+      .select()
+      .from(modules)
+      .where(eq(modules.id, "BIO101"))
+      .then((r) => r[0] ?? null);
+
+    assertEquals(row, null);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});